Radiation Dshpot

[nimatehran]

Hello ;

I want to model Translational and Rotational springs with “C” and “K” coefficient at a node with zerolength element.(K_x, K_y, K_z, K_xx, K_yy, K_zz) I don't know how assign C parameter in springs specially in rotational springs. Please help me.
Thanks.

[yegoroff]

You can define a uniaxial Viscous material, which will define your C parameter: uniaxialMaterial Viscous $matTag $C $alpha (http://opensees.berkeley.edu/wiki/index ... s_Material)
Additionally, you can define your K parameter using an uniaxial Elastic material: uniaxialMaterial Elastic $matTag $E <$eta> <$Eneg> (http://opensees.berkeley.edu/wiki/index ... l_Material). This is slightly more complex, as you will have to express your E value through your desired sitffness, thus, depending on the complexity of the model, this might be a challenge.

These two materials can be used in element zeroLength as arguments, which will define your springs.

Also, fmk has given an example here: http://opensees.berkeley.edu/community/ ... ot#p103445

[nimatehran]

Dear yegoroff;

Thanks a lot